APA (7th ed.) Citation

(1990). X Toolkit Intrinsics Reference Manual: For X11, Release 4 (2nd ed.). O' Reilly and Associates, Inc.

Chicago Style (17th ed.) Citation

X Toolkit Intrinsics Reference Manual: For X11, Release 4. 2nd ed. Sebastopol CA: O' Reilly and Associates, Inc, 1990.

MLA (8th ed.) Citation

X Toolkit Intrinsics Reference Manual: For X11, Release 4. 2nd ed. O' Reilly and Associates, Inc, 1990.

Warning: These citations may not always be 100% accurate.